CityFFD – City fast fluid dynamics for urban microclimate simulations on graphics processing units

Mortezazadeh, Mohammad; Wang, Liangzhu; Albettar, Maher; Yang, Senwen

doi:10.1016/j.uclim.2021.101063

Cited by 32 publications

(5 citation statements)

References 54 publications

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“…Mortezazadeh et al [65] presented the structure of a novel simulation tool called CityFFD, developed to respond to large-scale problems, including describing airflow around buildings, natural ventilation, and thermal stratification. It models the airflow using non-dimensional Navier-Stokes equations and introduces novel turbulence models based on the Smagorinsky Large Eddy Simulation method.…”

Section: Envimetmentioning

confidence: 99%

Integration of PV Systems in the Urban Environment—A Review

Rodrigues,

Palmero-Marrero,

Oliveira

2024

Preprint

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Building integrated photovoltaics (BIPV) consists of PV panels that are integrated into the building as part of the construction. This technology has advantages such as the production of electricity without necessary additional land area. This paper provides a literature review about the recent developments in urban building energy modelling, including tools and methods, and the effect of PV systems on building outdoor and indoor environments. It is also intended to provide a critical analysis on how PV systems affect the urban environment, both from an energy and a comfort point of view. The urban heat island development is introduced and related with the existence of PV systems. It is concluded that data acquisition is still a weakness in urban building energy modelling, especially in what concerns non-geometric data, which leads to a major source of errors. The availability of data is a challenge because frequently they are not accessible, due to privacy, high-cost or other reasons. Also, methodologies to develop precise archetypes for creating urban building energy models are lacking.

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Section: Envimetmentioning

confidence: 99%

Integration of PV Systems in the Urban Environment—A Review

Rodrigues,

Palmero-Marrero,

Oliveira

2024

Preprint

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“…Another study incorporated ENVI-met, a Computational Fluid Dynamics (CFD) simulation tool, and TRNSYS to estimate thermal outdoor comfort and mean radiant temperature, as well as to study the effects of urban form and vegetation on the microclimate of cities [35]. Another integrated platform was developed by coupling City Fast Fluid Dynamics (CityFFD) and City Building Energy Model (CityBEM) [36][37][38]. The platform produced high-resolution results of building thermal load and microclimate conditions during weather extremes in Montreal, Canada.…”

Section: Urban Heat Island and Its Impact Evaluationmentioning

confidence: 99%

“…A 24 h period was simulated with 1 h timesteps and 4000 iterations per timestep. The turbulence closure was achieved by the large eddy simulation (LES) [58].…”

Section: Urban Microclimate Modelingmentioning

confidence: 99%

Integrating Urban Heat Island Impact into Building Energy Assessment in a Hot-Arid City

et al. 2023

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Dense cities usually experience the urban heat island (UHI) effect, resulting in higher ambient temperatures and increased cooling loads. However, the typical lack of combining climatic variables with building passive design parameters in significant evaluations hinders the consideration of the UHI effect during the building design stage. In that regard, a global sensitivity analysis was conducted to assess the significance of climatic variables and building design features in building energy simulations for an office building. Additionally, this study examines the UHI effect on building energy performance in Qatar, a hot-arid climate, using both measurement data and computational modeling. This study collects measurement data across Qatar and conducts computational fluid dynamics (CFD) simulations; the results from both methods serve as inputs in building energy simulation (BES). The results demonstrate that space cooling demand is more sensitive to ambient temperature than other climatic parameters, building thermal properties, etc. The UHI intensity is high during hot and transition seasons and reaches a maximum of 13 °C. BES results show a 10% increase in cooling energy demand for an office building due to the UHI effect on a hot day. The results of this study enable more informed decision-making during the building design process.

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“…The spatial thermal impact of individual urban structures is initially unknown and dependent on the dynamics of the urban atmosphere. Many models tried to reproduce the dynamics with the help of computational fluid dynamics (CFD) [47][48][49][50][51][52][53]. For this study, the assumption was made that there is no horizontal air mass exchange, so that the UHI forms a typical spatial pattern.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Normalized Urban Heat Island for the City of Karlsruhe by Linking Urban Morphology and Green Infrastructure

Gangwisch,

Ludwig,

Matzarakis

2024

Atmosphere

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Citizens in urban areas are affected by the urban heat island (UHI) effect, resulting in increased thermal heat compared to rural areas. This threat is exacerbated by global climate change. Therefore, it is necessary to assess human thermal comfort and risk for decision making. This is important for planners (climate resilience), the health sector (information for vulnerable people), tourism, urban designers (aesthetics), and building architects. Urban structures modify local meteorological parameters and thus human thermal comfort at the microscale. Knowledge of the pattern of a city’s UHI is typically limited. Based on previous research, gam were built to predict the spatial pattern of the UHI in the city of Karlsruhe. The models were trained with administrative, remotely sensed, and land use and land cover geodata, and validated with measurements in Freiburg. This identified the hot and cold spots and the need for further urban planning in the city. The model had some limitations regarding water bodies and anthropogenic heat production, but it was well suited for applications in mid-latitude cities which are not topographically characterized. The model can potentially be used for other cities (e.g., in heat health action plans) as the training data are freely available.

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CityFFD – City fast fluid dynamics for urban microclimate simulations on graphics processing units

Cited by 32 publications

References 54 publications

Integration of PV Systems in the Urban Environment—A Review

Integration of PV Systems in the Urban Environment—A Review

Integrating Urban Heat Island Impact into Building Energy Assessment in a Hot-Arid City

Modeling the Normalized Urban Heat Island for the City of Karlsruhe by Linking Urban Morphology and Green Infrastructure

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